Previous studies of the properties of electroslag weld metal have been done using electroslag remelted ingots made under welding conditions. This procedure assumes the electrical and thermal regimes of these processes to be equivalent. To test this assumption an experimental program was devised in which the remelted metal of an ingot and weld made with each of three slag systems was analysed and the mechanical properties examined. The results show that each process imparted different properties to the remelted metal by alloy and inclusion modification. Consequently the above assumption was proved invalid. Special consideration was given to the effect of inclusion composition and overall distribution toward mechanical properties. / Applied Science, Faculty of / Materials Engineering, Department of / Graduate

M.Ing.

Orientador: Roseana da Exaltação Trevisan / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica / Made available in DSpace on 2018-07-20T17:28:52Z (GMT). No. of bitstreams: 1 Martins_Fabio_M.pdf: 22725081 bytes, checksum: 81361c3b5241717bc5582be66052aec5 (MD5) Previous issue date: 1995 / Resumo: Trincas de Reaquecimento ocorrem, em geral, na zona afetada pelo calor de juntas soldadas de aços estruturais de baixa liga e alta resistência durante um tratamento térmico de alívio de tensões pós-soldagem. O Teste de Implante Modificado mostrou-se como uma forma eficaz para a avaliação da suscetibilidade dos metais a este problema. Este trabalho tem como objetivo principal a construção de um equipamento para teste de implante modificado para a avaliação da suscetibilidade à trinca de reaquecimento. A aferição do equipamento é feita através do ensaio de dois aços nacionais, dos quais um suscetível ao problema e outro não / Abstract: Reheat Crackings occur, in general, in the heat affected zone of welded joints of high strength low alloy structural steels during a post welding stress relief heat treatment. The modified implant test showed an effective form to the metal's susceptibility evaluation to this problem. This work had as main objective the construction of a modified implant test equipment to the reheat cracking's susceptibility evaluation. The checking of the equipment was done through of test of two national steels, ,one of which is susceptible to the problem and other is not / Mestrado / Materiais e Processos de Fabricação / Mestre em Engenharia Mecânica

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Thesis (Ph. D.)--West Virginia University, 2007. / Title from document title page. Document formatted into pages; contains xii, 135 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 106-112).

Thesis (Ph.D.)--Tufts University, 1999. / Adviser: Haris Doumanidis. Submitted to the Dept. of Mechanical Engineering. Includes bibliographical references (leaves 126-129). Access restricted to members of the Tufts University community. Also available via the World Wide Web;

Thesis (M.S.)--University of Wisconsin--Madison, 1966. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 103).

Friction StirWelding (FSW) has been researched for a number of years since its inception in 1991. The work thus far has been based on understanding the material and thermal flow using the standard fixed pin tool. The keyhole resulting during tool extraction in a FSW weld, is a disadvantage and a current limiting factor. Eliminating this effect from a weld using a movable pin tools would make FSW more commercially viable. This dissertation focuses on the design of a novel retractable pin tool, and highlights the problems encountered during the welding of Aluminum plates, Al2024 and Al5083. Previously studied techniques of material and thermal flow were used, to investigate the effect of the tool during extraction in a FSW weld. A prototype retractable tool was designed using parametric and axiomatic design theory, and implementing a pneumatic muscle actuation system. The resulting problems in the calibration of the retractable pin tool and the resulting welds are presented, these results confirming previous studies. The movable pin produced discrepancies the heat generation around the shoulder during a FSW weld. The failure of this tool to produce a reasonable weld showed that previous ideas into the workings of a retractable pin tool requires further investigation, furthermore a fresh approach to the interpretation and understanding of the FSW weld process needs consideration.

Cast irons are iron-carbon alloys with greater than 1.7% carbon. Although white, malleable and ductile cast irons are used extensively for casting work, this study is concerned with only the gray cast irons.